EX-4.1



 Exhibit 4.1 
 




 
  
 NUMBER 
 AB 

INCORPORATED UNDER THE 
 LAWS OF THE STATE 
 OF DELAWARE 

AnaptysBio 
 SHARES 
 CUSIP 032724 10 6 

SEE REVERSE FOR CERTAIN DEFINITIONS 
 This certifies that 
 is the record holder of

 FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $0.001 PAR VALUE PER SHARE, OF 

AnaptysBio, Inc. 
 transferable on the books of the corporation in person or by duly authorized attorney upon surrender of this Certificate properly endorsed. This Certificate is not valid until
countersigned by the Transfer Agent and registered by the Registrar. 
 WITNESS the facsimile seal of the
Corporation and the facsimile signatures of its duly authorized officers. 
 Dated: 

President, Chief Executive Officer & Secretary 

ANAPTYSBIO, INC. 
 CORPORATE 
 SEAL 

NOVEMBER 16, 2005 
 * DELAWARE * 
 Chief Financial Officer 

COUNTERSIGNED AND REGISTERED: 
 AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC 
 (BROOKLYN, NY) TRANSFER AGENT AND REGISTRAR 
 BY:

 AUTHORIZED SIGNATURE 







 



 
  
 The
Corporation shall furnish without charge to each stockholder who so requests a statement of the powers, designations, preferences and relative, participating, optional or other special rights of each class of stock of the Corporation or series
thereof and the qualifications, limitations or restrictions of such preferences and/or rights. Such requests shall be made to the Corporation’s Secretary at the principal office of the Corporation. 

KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED THE CORPORATION WILL REQUIRE A BOND INDEMNITY
AS A CONDITION TO THE ISSUANCE OF A REPLACEMENT CERTIFICATE. 
 The following abbreviations, when used in the
inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: 
 TEN COM – as tenants in common UNIF GIFT MIN ACT – Custodian 
 TEN ENT – as tenants by the entireties (Cust) (Minor) 
 JT TEN – as joint tenants with right of survivorship and not as tenants in common 
 under Uniform Gifts to Minors Act (State) 
 COM
PROP – as community property 
 UNIF TRF MIN ACT – Custodian (until age) 

(Cust) under Uniform Transfers 
 (Minor) to Minors Act (State) 
 Additional
abbreviations may also be used though not in the above list. 
 FOR VALUE RECEIVED,
            hereby sell(s), assign(s) and transfer(s) unto 
 PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE 
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE) 
 shares of the capital stock represented by within Certificate, and do hereby irrevocably constitute and appoint attorney-in-fact to transfer the said stock on the books of the within named
Corporation with full power of the substitution in the premises. 
 Dated 

X 
 X 
 Signature(s) Guaranteed: NOTICE: THE SIGNATURE
TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER. 
 By 
 THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN
ELIGIBLE GUARANTOR INSTITUTION, (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15. GUARANTEES BY A NOTARY PUBLIC ARE NOT
ACCEPTABLE. SIGNATURE GUARANTEES MUST NOT BE DATED.